6 to 8 hrs for digestion. it stays in the stomach for 2 hours and then in the intestine for another 2 hours. the undigested food goes to the large intestine and the digested food goes to whole body through blood. Carbhydrates and proteins about 1 1/2 -2 hrs. Fats 2 hrs.
And based on that a foetus does not posses self-awareness. Human babies have been found to become self aware between the ages of 18-24 months. The rouge test is a self-recognition test that identifies a human child's ability to recognize a reflection in a mirror as his or her own.
Either you freak out or you become acutely aware. That kind of alert awareness where there is no dissipation of energy on any thought is self-aware. To your question on whem it starts, its not a question of age, it is a question of ripeness of the mind. Views. , The answer to the question of life is 42.